Pulsed neutron generated prompt gamma emission measurement system for surface defect detection and analysis

Abstract

A method of determining structural defects in a component that utilizes neutron activation of a solution having the ability to penetrate small cracks on the surface of a material via capillary absorption that produces a discernable prompt gamma release of a defined energy when exposed to a neutron pulse. The intensity of the gamma rays produced at the desired energy at a user controlled position on the surface is used to determine the crack location, length and depth.

Description

BACKGROUND[0001]1. Field[0002]This invention relates in general to the detection of cracks in irradiated surfaces and, more particularly, the nondestructive examination of irradiated components to determine structural flaws.[0003]2. Related Art[0004]In the event highly radioactive components or the containers of radioactive materials need to be manipulated, it is important to ensure the structural integrity of the components or material containers be assessed to minimize the potential for loss of control and containment of the radioactive material. The structural integrity of radioactive components or containers of radioactive materials resident in high radiation fields is difficult to assess using standard visual and ultrasonic Non-Destructive Examination (NDE) techniques due to the impact the radiation field has on equipment access and operability. A need exists to provide a means to evaluate the structural integrity of radioactive components and containers of radioactive material...

AI Technical Summary

Benefits of technology

This patent is about a method for detecting defects in the surface of a material without causing damage. The method involves applying a liquid mixture containing a substance that emits a signature gamma ray when exposed to a neutron pulse. The material is then irradiated with a neutron generator and beta radiation detectors positioned around the surface. The detection of the gamma ray indicates specific characteristics of the defect, such as its location and depth. The mixture is absorbed into the surface through capillary absorption, and the beta detectors are placed between the surface and the detector to minimize the detection of unwanted electrons. The use of a sacrificial material, such as platinum or tungsten, between the detector and the surface ensures that most of the electrons from the desired gamma ray energy are stopped inside the detector.

Problems solved by technology

The structural integrity of radioactive components or containers of radioactive materials resident in high radiation fields is difficult to assess using standard visual and ultrasonic Non-Destructive Examination (NDE) techniques due to the impact the radiation field has on equipment access and operability.

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